Lamp

Abstract

Provided is a lamp with an LED that can prevent snow from sticking or snow melted thereon from freezing. A lamp ( 10 ) includes: an LED module ( 11 ) serving as a light source; a heatsink ( 12 ); a heat transfer unit ( 13 ); a light distribution unit ( 14 ); a housing ( 15 ) with an opening; and a light-transmissive cover ( 16 ). The LED module ( 11 ) includes a plurality of LEDs, and an LED substrate having a mounting surface on which the plurality of LEDs are mounted. The heatsink ( 12 ) is arranged on the side of the LED substrate opposite to the mounting surface. The light distribution unit ( 14 ) is arranged on the light emitting side of the LED module ( 11 ). The LED module ( 11 ), the heatsink ( 12 ), and the light distribution unit ( 14 ) are arranged in the housing ( 15 ). The light-transmissive cover ( 16 ) is arranged in the opening of the housing ( 15 ). The heat transfer unit ( 13 ) includes a heat conduction section ( 13 a ) and a heat discharge section ( 13 b ), the heat conduction section ( 13 a ) being arranged so as to conduct heat from the heatsink ( 12 ), and the heat discharge section ( 13 b ) being arranged so as to be able to discharge the heat to the light-transmissive cover ( 16 ).

The invention claimed is: 
     
       1. A lamp comprising:
 an LED module serving as a light source; 
 a heatsink; 
 a heat transfer unit; 
 a light distribution unit; 
 a housing with an opening; and 
 a light-transmissive cover, 
 wherein the LED module comprises a plurality of LEDs, and an LED substrate having a mounting surface on which the plurality of LEDs are mounted, 
 wherein the heatsink is arranged on a side of the LED substrate opposite to the mounting surface, 
 wherein the light distribution unit is arranged on a light emitting side of the LED module, 
 wherein the LED module, the heatsink, and the light distribution unit are arranged in the housing, 
 wherein the light-transmissive cover is arranged in the opening of the housing, 
 wherein the heat transfer unit comprises a heat conduction section and a heat discharge section, the heat conduction section being arranged so as to conduct heat from the heatsink, the heat discharge section being arranged so as to be able to discharge the heat to the light-transmissive cover, 
 wherein the heat discharge section of the heat transfer unit is arranged on a light-transmissive cover side, and one end of the heat conduction section of the heat transfer unit is thermally connected to the heatsink, 
 wherein the light distribution unit comprises a reflector extended from the LED module towards the light-transmissive cover, 
 wherein the heat conduction section is arranged between the reflector and the housing, 
 wherein the heat discharge section is arranged between the reflector and the light-transmissive cover, 
 wherein the heat discharge section is cantilevered away from the heat sink and towards the light-transmissive cover by the heat conduction section, and 
 wherein the reflector comprises a reflecting surface subjected to high reflection processing. 
 
     
     
       2. The lamp according to  claim 1 ,
 wherein the heat discharge section is arranged on a lower side of the lamp when it is installed. 
 
     
     
       3. The lamp according to  claim 1 ,
 wherein the light-transmissive cover is provided with a hot-wire heater thermally connected to the heat discharge section. 
 
     
     
       4. The lamp according to  claim 1 ,
 wherein the heat transfer unit comprises a heat pipe. 
 
     
     
       5. The lamp according to  claim 1 , wherein the reflector is tubular, and the LED module and the heatsink are arranged in an opening, on a light source side, of the reflector with the mounting surface directed toward an opening, on a light emitting side, of the reflector. 
     
     
       6. The lamp according to  claim 1 ,
 wherein the heat discharge section is formed at an end of the heat transfer unit, and 
 the other end of the heat transfer unit is thermally connected to the heatsink. 
 
     
     
       7. The lamp according to  claim 1 ,
 wherein the lamp is used in a flashing device for guiding landing of an aircraft. 
 
     
     
       8. The lamp according to  claim 1 ,
 wherein the heatsink has a plate-like shape. 
 
     
     
       9. The lamp according to  claim 1 ,
 wherein the reflector comprises a reflecting surface from the high reflection processing, 
 wherein the reflecting surface comprises at least one of a plating arranged on the reflector and a reflective paint, and 
 wherein the reflector comprises a tubular shape comprising a larger cross-section closer light transmissive cover than a cross-section closer to the LED module.